Question

How do you solve `\frac { x } { 1 2 } = \frac { 8 0 } { 1 0 0 }`?

Answer 1

`x=9.6` or `48/5`

Explanation:

Because it is a proportion, cross multiply

`100xxx=100x`

`12xx80=960`

So, now the equation looks like:
`100x=960`

Isolate x by dividing by 100 on both sides of the equation
`x=9.6` or `48/5`